A) Conductivity & molar conductivity of solution increase on dilution
B) Voltage of button cell remain unchanged throughout its life time
C) On electrolysis of aqueous \[CuS{{O}_{4}}\] using platinum electrode its concentration \[[C{{u}^{2+}}]\] remain constant
D) On electrolysis of aqueous \[NaCl,\] solution becomes acidic
Correct Answer: B
Solution :
| [b] (1) Conductivity decrease with increase in dilution while molar conductivity increases with increase in dilution. |
| (2) Voltage of button cell remain constant throughout its life time because the overall reaction does not involve any ion in solution whose concentration can change during its life time. |
| (3) At cathode: Discharge potential of \[C{{u}^{2+}}<\] discharge potential of \[{{H}^{+}}\] |
| \[\therefore \] \[C{{u}^{+2}}(aq)+2{{e}^{-}}\xrightarrow[{}]{{}}Cu(s)\] |
| So concentration of \[C{{u}^{2+}}\] decreases with time. |
| (4) On electrolysis of aqueous \[NaCl,\] |
| At cathode: \[{{H}^{+}}(aq)+{{e}^{-}}\xrightarrow[{}]{{}}\frac{1}{2}{{H}_{2}}(g)\] |
| At anode \[C{{l}^{-}}(aq)\xrightarrow[{}]{{}}\frac{1}{2}C{{l}_{2}}(g)+{{e}^{-}}\] so \[O{{H}^{-}}\] remain in the solution. So solution become basic. |
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